DIFF Subgroup
H01F 21/02 continuously variable, e.g. variometers
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Variable inductances or transformers of the signal type > continuously variable, e.g. variometers
CPC:
Variable inductances or transformers of the signal type (H01F36/00 takes precedence) > continuously variable, e.g. variometers
IPC and CPC are identically structured here. All 4 subcodes exist in both systems.
Child Classifications
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- H01F 21/06 by movement of core or part of core relative to the windings as a whole +1 CPC IPC+CPC Available in IPC and CPC
- H01F 21/08 by varying the permeability of the core, e.g. by varying magnetic bias IPC+CPC Available in IPC and CPC